https://en.wikipedia.org/wiki/Apache_Spark https://en.wikipedia.org/wiki/Apache_Spark right? My understanding was it was built on Hadoop (https://en.wikipedia.o

https://en.wikipedia.org/wiki/Apache_Spark https://en.wikipedia.org/wiki/Apache_Spark right? My understanding was it was built on Hadoop (https://en.wikipedia.org/wiki/Apache_Hadoop https://en.wikipedia.org/wiki/Apache_Hadoop) infrastructure.